Physics for IGCSE & O level - Rays And Waves (Section 6 - No. 22)
What are the main parts of a simple telephone system?
Encoder, Amplifier, Decoder
Microphone, Encoder, Transmission path, Decoder, Earphone
Transmitter, Receiver, Antenna
Amplifier, Speaker
הֶסבֵּר
A simple telephone system includes all the listed parts.